12AX7 tube equivalents

Technical information.  Substitutions, notes. http://milbert.com/articles#12ax7   The 12AX7 is a miniature dual triode vacuum tube, also known as an electron valve, that has played a significant role in the development of electronic equipment, particularly in audio applications. Introduced in the late 1940s by RCA (Radio Corporation of America), the 12AX7 was designed for use in … Read more